DE601527T1 - System for checking the higher harmonic vibrations in the rotor blades of a helicopter. - Google Patents
System for checking the higher harmonic vibrations in the rotor blades of a helicopter.Info
- Publication number
- DE601527T1 DE601527T1 DE0601527T DE93119661T DE601527T1 DE 601527 T1 DE601527 T1 DE 601527T1 DE 0601527 T DE0601527 T DE 0601527T DE 93119661 T DE93119661 T DE 93119661T DE 601527 T1 DE601527 T1 DE 601527T1
- Authority
- DE
- Germany
- Prior art keywords
- cylinder
- hhc
- rotor blade
- force
- higher harmonic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/32—Rotors
- B64C27/46—Blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/54—Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement
- B64C27/56—Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement characterised by the control initiating means, e.g. manually actuated
- B64C27/57—Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement characterised by the control initiating means, e.g. manually actuated automatic or condition responsive, e.g. responsive to rotor speed, torque or thrust
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/001—Vibration damping devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/54—Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement
- B64C27/72—Means acting on blades
- B64C2027/7205—Means acting on blades on each blade individually, e.g. individual blade control [IBC]
- B64C2027/7261—Means acting on blades on each blade individually, e.g. individual blade control [IBC] with flaps
- B64C2027/7294—Means acting on blades on each blade individually, e.g. individual blade control [IBC] with flaps actuated mechanically, e.g. by means of linkages
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/30—Wing lift efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S416/00—Fluid reaction surfaces, i.e. impellers
- Y10S416/50—Vibration damping features
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Toys (AREA)
- Catching Or Destruction (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Vibration Prevention Devices (AREA)
- Wind Motors (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Abstract
Higher harmonic control (hereinafter HHC) of helicopter rotor blade vibrations is provided by an actively controlled, rotatable, slotted cylinder (11) which is mounted at an outboard section of each blade (12). Continuous rotation of each cylinder (11) about its longitudinal axis produces a periodic aerodynamic force on the blade (12) at a frequency of twice the rotational frequency of the cylinder. The amplitude of force is controlled by the size of a slot opening (110,111,112,133) in the cylinder while the rotational speed of the cylinder is synchronized to run at a multiple of the speed of a rotor blade drive shaft. The amplitude and phase of the HHC force is regulated, either manually or by active feedback control, to minimize any vibratory load transmitted to the airframe through the rotor blade drive shaft. A significant advantage offered by this concept, relative to other HHC methods, is its low power requirement. <IMAGE>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/989,583 US5314308A (en) | 1992-12-11 | 1992-12-11 | System for controlling higher harmonic vibrations in helicopter rotor blades |
Publications (1)
Publication Number | Publication Date |
---|---|
DE601527T1 true DE601527T1 (en) | 1995-04-06 |
Family
ID=25535244
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69310111T Expired - Fee Related DE69310111T2 (en) | 1992-12-11 | 1993-12-07 | System for checking the higher harmonic vibrations in the rotor blades of a helicopter |
DE0601527T Pending DE601527T1 (en) | 1992-12-11 | 1993-12-07 | System for checking the higher harmonic vibrations in the rotor blades of a helicopter. |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE69310111T Expired - Fee Related DE69310111T2 (en) | 1992-12-11 | 1993-12-07 | System for checking the higher harmonic vibrations in the rotor blades of a helicopter |
Country Status (11)
Country | Link |
---|---|
US (1) | US5314308A (en) |
EP (1) | EP0601527B1 (en) |
JP (1) | JPH072187A (en) |
KR (1) | KR940014085A (en) |
CN (1) | CN1092727A (en) |
AT (1) | ATE152062T1 (en) |
DE (2) | DE69310111T2 (en) |
DK (1) | DK0601527T3 (en) |
ES (1) | ES2060576T3 (en) |
GR (2) | GR940300078T1 (en) |
TW (1) | TW239107B (en) |
Families Citing this family (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19528155C1 (en) * | 1995-08-02 | 1996-06-27 | Deutsche Forsch Luft Raumfahrt | Helicopter rotor blade of glass fibre reinforced synthetic resin |
US5973440A (en) | 1997-07-07 | 1999-10-26 | Nitzsche; Fred | Structural component having means for actively varying its stiffness to control vibrations |
EP0936140A4 (en) * | 1997-09-10 | 2002-07-10 | Inst Adv Tech Helicopter Ltd | Rotor control system |
FR2770826B1 (en) * | 1997-11-07 | 2000-01-07 | Eurocopter France | ROTOR BLADE WITH ADJUSTABLE SHUTTER |
DE10035333B4 (en) * | 2000-07-20 | 2008-08-14 | Eads Deutschland Gmbh | Rotor blade with control flaps |
DE10052757A1 (en) * | 2000-10-25 | 2002-05-08 | Zf Luftfahrttechnik Gmbh | Rotor blade control device |
US6493689B2 (en) | 2000-12-29 | 2002-12-10 | General Dynamics Advanced Technology Systems, Inc. | Neural net controller for noise and vibration reduction |
US6671590B1 (en) | 2001-04-30 | 2003-12-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Method and system for active noise control of tiltrotor aircraft |
CA2454575C (en) * | 2001-08-02 | 2009-02-24 | Bell Helicopter Textron Inc. | Helicopter main rotor blade balance weight retention assembly |
FR2871435B1 (en) | 2004-06-10 | 2006-08-18 | Eurocopter France | DEVICE FOR INDICATING A BEAT LEVEL |
US7448854B2 (en) | 2004-08-30 | 2008-11-11 | Lord Corporation | Helicopter vibration control system and rotary force generator for canceling vibrations |
US7722322B2 (en) | 2004-08-30 | 2010-05-25 | Lord Corporation | Computer system and program product for controlling vibrations |
US8435002B2 (en) | 2004-08-30 | 2013-05-07 | Lord Corporation | Helicopter vibration control system and rotating assembly rotary forces generators for canceling vibrations |
US8267652B2 (en) | 2004-08-30 | 2012-09-18 | Lord Corporation | Helicopter hub mounted vibration control and circular force generation systems for canceling vibrations |
US8162606B2 (en) | 2004-08-30 | 2012-04-24 | Lord Corporation | Helicopter hub mounted vibration control and circular force generation systems for canceling vibrations |
DE102005007129B4 (en) * | 2005-02-17 | 2008-07-10 | Zf Friedrichshafen Ag | Device for controlling rotor blades of a helicopter |
US7648338B1 (en) | 2006-09-14 | 2010-01-19 | Sikorsky Aircraft Corporation | Dual higher harmonic control (HHC) for a counter-rotating, coaxial rotor system |
KR101486721B1 (en) | 2007-10-25 | 2015-01-28 | 로드코포레이션 | Distributed active vibration control systems and rotary wing aircraft with suppressed vibrations |
FR2929253B1 (en) | 2008-03-28 | 2013-09-13 | Sartorius Stedim Biotech Sa | RIGID FRAME FOR 3D CONTAINER CONTAINING AT LEAST PARTIALLY DEFORMABLE |
US8985068B2 (en) | 2010-07-22 | 2015-03-24 | Robert Bosch Gmbh | Systems and methods for avoiding resonances excited by rotating components |
KR101911000B1 (en) | 2011-02-04 | 2018-10-23 | 로오드 코포레이션 | Rotary wing aircraft vibration control system with resonant inertial actuators |
WO2013120103A1 (en) | 2012-02-10 | 2013-08-15 | Appareo Systems, Llc | Frequency-adaptable structural health and usage monitoring system |
US10607424B2 (en) | 2012-02-10 | 2020-03-31 | Appareo Systems, Llc | Frequency-adaptable structural health and usage monitoring system (HUMS) and method with smart sensors |
US9816529B2 (en) | 2013-03-15 | 2017-11-14 | Kcf Technologies, Inc. | Propeller sound field modification systems and methods |
US9394045B2 (en) | 2013-03-15 | 2016-07-19 | Kcf Technologies, Inc. | Propeller sound field modification systems and methods |
JP6469389B2 (en) * | 2014-08-29 | 2019-02-13 | 三菱航空機株式会社 | Aircraft vibration system and aircraft |
CN104670492B (en) * | 2015-01-23 | 2016-11-16 | 南京航空航天大学 | A kind of helicopter blade embedded radial motion shimmy damper |
IL240316B (en) | 2015-08-03 | 2018-10-31 | Technion Res & Dev Foundation | Method and system for parametric amplification |
US20170129597A1 (en) * | 2015-11-10 | 2017-05-11 | Sikorsky Aircraft Corporation | Reduced power individual blade control system on a rotorcraft |
DE102016213720A1 (en) | 2016-07-26 | 2018-02-01 | Zf Friedrichshafen Ag | System for data transmission and processing for controlling a rotor blade actuator |
US11299263B2 (en) | 2016-12-07 | 2022-04-12 | Textron Innovations Inc. | Automatic, active blade tracking and balance system |
CN108639335B (en) * | 2018-04-04 | 2020-06-02 | 北京航空航天大学 | Flexible deformation system of helicopter rotor aileron for vibration and noise control |
CN113955142B (en) * | 2021-10-09 | 2023-09-05 | 中国直升机设计研究所 | Rotor wing 1 omega harmonic vibration real-time adjustment control method |
CN115056979B (en) * | 2022-07-01 | 2023-05-23 | 南京航空航天大学 | Active vibration control method and system based on periodic motion of rotor wing shimmy direction |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB219664A (en) * | 1923-07-28 | 1925-10-27 | "N.V. Instituut Voor Aero- En Hydro-Dynamiek" | |
US1785333A (en) * | 1926-11-18 | 1930-12-16 | Trey Serge | Helicopter |
FR855833A (en) * | 1939-06-07 | 1940-05-21 | Device for producing a force resulting from the flow of a fluid especially for airplanes | |
US2344515A (en) * | 1941-01-17 | 1944-03-21 | Henry P Massey | Means and method for increasing the magnus effect |
GB616163A (en) * | 1943-01-19 | 1949-01-18 | Groupement Francais Pour Le Developpement Des Recherches Aeronautiques | Means for avoid separation and turbulence in fluids moving with respect to solid surfaces |
FR1104006A (en) * | 1952-04-23 | 1955-11-15 | Improvements to airfoil bearing surfaces | |
GB1153137A (en) * | 1965-08-31 | 1969-05-21 | Hovercraft Dev Ltd | Cycloidal Propeller |
US3649132A (en) * | 1970-03-02 | 1972-03-14 | United Aircraft Corp | Vibration control for rotors |
US3692259A (en) * | 1970-06-26 | 1972-09-19 | Shao Wen Yuan | Wing-tip vortices control |
US4040578A (en) * | 1973-12-17 | 1977-08-09 | Shao Wen Yuan | Rotor vortex control |
US4236607A (en) * | 1979-02-26 | 1980-12-02 | Textron, Inc. | Vibration suppression system |
US4514143A (en) * | 1983-04-28 | 1985-04-30 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Aircraft rotor blade with passive tuned tab |
DE3534169A1 (en) * | 1985-09-25 | 1987-03-26 | Wolfgang Loesel | Circulation stimulation for lift profiles for increasing lift and reducing resistance |
US4655685A (en) * | 1985-12-16 | 1987-04-07 | United Technologies Corporation | Helicopter main rotor blade having a short span slot near the tip end |
US4809553A (en) * | 1987-07-16 | 1989-03-07 | Dynamic Engineering Inc. | Flutter exciter |
US4965879A (en) * | 1988-10-13 | 1990-10-23 | United Technologies Corporation | X-wing fly-by-wire vehicle management system |
US4953098A (en) * | 1988-10-13 | 1990-08-28 | United Technologies Corporation | Higher harmonic control system for X-Wing aircraft |
US5099430A (en) * | 1988-10-28 | 1992-03-24 | Joseph Hirsch | Method and apparatus for continuously suppressing unwanted rotational phenomena in a rotating body |
-
1992
- 1992-12-11 US US07/989,583 patent/US5314308A/en not_active Expired - Fee Related
-
1993
- 1993-12-07 DK DK93119661.2T patent/DK0601527T3/en active
- 1993-12-07 ES ES93119661T patent/ES2060576T3/en not_active Expired - Lifetime
- 1993-12-07 AT AT93119661T patent/ATE152062T1/en not_active IP Right Cessation
- 1993-12-07 DE DE69310111T patent/DE69310111T2/en not_active Expired - Fee Related
- 1993-12-07 KR KR1019930026642A patent/KR940014085A/en not_active Application Discontinuation
- 1993-12-07 EP EP93119661A patent/EP0601527B1/en not_active Expired - Lifetime
- 1993-12-07 DE DE0601527T patent/DE601527T1/en active Pending
- 1993-12-10 TW TW082110499A patent/TW239107B/zh active
- 1993-12-10 JP JP5310849A patent/JPH072187A/en active Pending
- 1993-12-10 CN CN93120882A patent/CN1092727A/en active Pending
-
1994
- 1994-11-30 GR GR940300078T patent/GR940300078T1/en unknown
-
1997
- 1997-07-02 GR GR970401640T patent/GR3023986T3/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE69310111T2 (en) | 1997-08-07 |
TW239107B (en) | 1995-01-21 |
GR3023986T3 (en) | 1997-10-31 |
ES2060576T3 (en) | 1997-06-16 |
ES2060576T1 (en) | 1994-12-01 |
EP0601527B1 (en) | 1997-04-23 |
CN1092727A (en) | 1994-09-28 |
JPH072187A (en) | 1995-01-06 |
ATE152062T1 (en) | 1997-05-15 |
EP0601527A1 (en) | 1994-06-15 |
DK0601527T3 (en) | 1997-10-27 |
US5314308A (en) | 1994-05-24 |
GR940300078T1 (en) | 1994-11-30 |
DE69310111D1 (en) | 1997-05-28 |
KR940014085A (en) | 1994-07-16 |
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